Retrieval of Atmospheric Horizontal Visibility by Statistical Regression from NOAA/AVHRR Satellite Data

Based on the atmospheric horizontal visibility data from forty-seven observational stations along the eastern coast of China near the Taiwan Strait and simultaneous NOAA/AVHRR multichannel satellite data during January 2001 to December 2002, the spectral characters associated with visibility were investigated. Successful retrieval of visibility from multichannel NOAA/AVHRR data was performed using the principal component regression （PCR） method. A sample of retrieved visibility distribution was discussed with a sea fog process. The correlation coefficient between the observed and retrieved visibility was about 0.82, which is far higher than the 99.9% confidence level by statistical test. The rate of successful retrieval is 94.98% of the 458 cases during 2001 2002. The error distribution showed that high visibilities were usually under-estimated and low visibilities were over-estimated and the relative error between the observed and retrieved visibilities was about 21.4%.     

地图图形数字化中的坐标转换

对兰勃脱,麦卡托,极射赤面投影的地图图形数字化中的直角坐标转换成相应的经纬度的过程进行讨论,并提出了相应的方法。     

气象传真图的快速显示

气象传真图的快速显示李伟田林生（胜利油田气象台,东营·２５７０００）利用计算机软硬件资源,开发了一套显示传真图软件,在２１和１７英寸显示器上可按１∶１的比例把传真图快速显示出来,显示效果相当好,给预报工作带来了极大的便利。１解码后的传真图文件数据格式...